Timber structure for mines



(No Model'.)

G. J. GOODHUE.

TIMBER STRUCTURE FOR MINES.

No. 429,439. Patented June 3, 1890.

I I i Y the following is a full, clear, and exact deform shown in Figs. 1, 2, and 3, respectively.

cavating a mine may require, substantially as UNITED STATES ATENT FICE' GEORGE J. GOODHUE, CHICAGO, ILLINOIS.

TIMBER STRUCTURE FOR MINES.

SPECIFICATION forming part of Letters Patent No. 429,439, dated June 3, 1890.

Application filed March 4, 1890. Serial No. 342,629. (No model.)

scription thereof.

My invention relates to timber structures for mines, being designed as an improvement on the structures described in my prior Letters Patent, Nos. 358,261 and 377,197, granted February 22, 1887, and January 21, 1888, respectively; and it consists in certain peculiarities of construction and combination of parts, as will be hereinafter described and subsequently claimed.

In the drawings,Figure 1 represents a side elevation, partly in section, of a structure embodying one form of my present invention. Fig. 2 is a partial plan View of the same. Fig. 3 is an end view of one of the caps in this form. Figs. 4, 5, and 6 are analogous views of another form of my present invention corresponding to the views of the other B B represent legs designed to be set upon a sill at each corner of a mine-chamber, as in my prior patents, hereinbefore referred to, and the tops of these legs are connected by caps C, that in turn are designed to support additional legs and their connecting-caps, the building of the structure being thus carried on in an upward direction, as the work of exwith my said prior devices. In those, however, I formed gudgeons at the extremities of my said legs, and this I have now done away with, for several reasons. In the first place, oftentimes timber otherwise suitable was hollow or of inferior quality at the center of the log, and, secondly, when more expensive timber was employed there was a great deal of waste in the portions of sound timber cut away to form said gudgeons, and hence in place thereof I form now a mortise a in each extremity of each leg B, and fit the same with dowel-pins A, which is equally as strong and effective and much cheaper.

In the form of device illustrated in the first three figures of my present drawings I have employed what is known as round timber, and the ends of the caps C may be shaped to leave top and bottom arc-shaped shoulders b b and tongues 0, these tongues being cut away to form central vertical end recesses d, and beveled at their sides at an angle of about forty-five degrees, as shown at e. In this form of my invention I further reduce the ends of the legs B to form vertical circular shoulders f and beveled circular shoulders g, the latter conforming to the shoulders b b of the caps, and the former to conform to arc-shaped shoulders h on the ends of said caps.

In the simpler form of my present invention (illustrated in the last three figures of the drawings) I have employed for my caps Q slabbed timberthat is, round (or other) timber squared or slabbed off at top and bottomand consequently with this form I make the ends of my legs 13 square. also, all as best shown in Figs. 4 and 6, forming the mortises a in the ends of the legs B, as before, and using the dowel-pins A and cutting the tongues c on the ends of my caps with vertical central end recesses d and beveled sides 6, as before, but omitting, of course, the areshaped shoulders on said caps. I have shown my dowel-pins A as round in cross-section, and consequently my recesses d as of round concave form; but this is merely a matter of preference or convenience, though probably the most desirable form in ordinary cases. The beveled sides 6 of the cap-tongues c, I regard as important to secure miter-joints, irrespective of the diameters of the logs or timbers employed; but the caps in my second form, herein illustrated, may be of square timber, if preferred, instead of round timber squared only on two opposing sides, as shown.

In Fig. 1 I show at one side a single dowelpinA uniting the adjacent ends of legs above and below the caps, and at the other side two of these pins A, one inserted in the mortise of each adjacent leg, this alsobeing a matter of preference or convenience in any given case.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a timber structure for mines, the combination, with suitable legs provided with central end mortises, of caps interposed between the adjacent ends of said legs, and dowel-pins engaging withsaid mortises and separating the opposing ends of said caps, substantially as set forth.

2. In a timber structure for mines, the combination, with caps having their respective ends cut away to form beveled tongues with central end recesses, of legs provided with central mortises in their respective ends, and dowel-pins engaging with said inortises and said recesses, substantially as set forth.

3. In a timber structure for mines, the coinb1nat1on,with legs squared at their ends and provided with central lnortises therein, of interposed caps squared on their opposing surfaces to conform to said leg ends, and dowelpins between the adjacent ends of said caps and in engagement with said mortises, substantially as set forth.

4. In a timber structure for mines, the combination,with legs squared at their ends and provided with central mortises therein, of interposed caps having their respective ends cut away to form beveled tongues with central end recesses, and squared on their opposing surfaces to conform'to said leg ends, and dowel-pins engaging with said lnortises and said recesses, substantially as setforth.

In testimony that I claim the foregoing I have hereunto set my hand, at Milwaukee, in

the county of Milwaukee and State of WViscousin, in the presence of two witnesses.

GEORGE J. GOODI-IUE.

Witnesses:

H. G. UNDERWOOD, WM. KLUG. 

